//
//@File    :	8.7_strquote.cpp
//@Time    :	2021/08/15 16:39:37
//@Auther  :	Sun Sheng
//@Contact :	970340843@qq.com
//@Desc    :	different designs
//

#include <iostream>
#include <string>

using namespace std;

string version1(const string &s1,const string &s2);
const string &version2(string &s1,const string &s2);
const string &version3(string &s1,const string &s2);

int main()
{
    string input;
    string copy;
    string result;

    cout<<"Enter a string: ";
    getline(cin,input);
    copy=input;
    cout<<"Your string as entered: "<<input<<endl;
    result=version1(input,"***");
    cout<<"Your string enhanced: "<<result<<endl;
    cout<<"Your original string: "<<input<<endl;

    result=version2(input,"###");
    cout<<"Your string enhanced: "<<result<<endl;
    cout<<"Your original string: "<<input<<endl;

    cout<<"Resetting original string.\n";
    input=copy;
    result=version3(input,"@@@");
    cout<<"Your string enhanced: "<<result<<endl;
    cout<<"Your original string: "<<input<<endl;
    system("pause");
    return 0;
}
string version1(const string &s1,const string &s2)
{
    string temp;

    temp=s2+s1+s2;
    return temp;
}
const string &version2(string &s1,const string &s2)
{
    s1=s2+s1+s2;
    return s1;
}
const string &version3(string &s1,const string &s2)
{
    string temp;

    temp=s2+s1+s2;
    return temp;
}